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OfflineRosen_Rot
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Help with some math skills
    #21584515 - 04/23/15 09:19 AM (9 years, 27 days ago)

So I am using SBJs Monotub Build TEK and I am trying to find out how high my holes need to be. I am using a BRAZCO Large clear plastic storage box and I need help with my math

My tubs measure 54cm(L) x 41cm(W) x 30.5cm(H)

V=L*W*H I need to solve H

First I found the volume; 54*41*30.5= 67527cm3

H=V/(L*W)

54cm*41cm = 2214cm2

I then divided that answer with the volume I found earlier

67527cm3/2214cm2 = 30.5cm

This can't be right. I basically went around for nothing lol.
My math skills suck.

What am I doing wrong? Some one help?


--------------------
:sporedrop:"The internet has one rule; use or be used" - Bjeldiablo :sporedrop:
''there is no loneliness, only moments where contentment is fleeting''

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Offlinespacechildo
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Re: Help with some math skills [Re: Rosen_Rot]
    #21584645 - 04/23/15 09:26 AM (9 years, 27 days ago)

you're going in circles and forgetting what you wanna know.
3-4" sub depth is a good choice, so I'd just put the holes at the 4" mark and up. bottom of holes at 4".

if you wanna know how much sub+spawn you need to fill your tub to the 4" (10cm) mark
it's simple:

5,4dm x 4,1dm x 1dm = 22 litres / quarts.

3" mark: 5,4 x 4,1 x 0,75 = 16,5 litres/quarts.

A more practical approach is to just fill the tub with water up to the desired mark and measure how much water it takes.

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OfflineMatt87
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Re: Help with some math skills [Re: spacechildo]
    #21584693 - 04/23/15 09:29 AM (9 years, 27 days ago)

Or just cut the holes after colonization.


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Once you understand the way broadly, you see it in all things. -Musashi

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OfflineRosen_Rot
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Re: Help with some math skills [Re: spacechildo]
    #21584827 - 04/23/15 09:43 AM (9 years, 27 days ago)

Quote:

spacechildo said:
you're going in circles and forgetting what you wanna know.
3-4" sub depth is a good choice, so I'd just put the holes at the 4" mark and up. bottom of holes at 4".

if you wanna know how much sub+spawn you need to fill your tub to the 4" (10cm) mark
it's simple:

5,4dm x 4,1dm x 1dm = 22 litres / quarts.

3" mark: 5,4 x 4,1 x 0,75 = 16,5 litres/quarts.

A more practical approach is to just fill the tub with water up to the desired mark and measure how much water it takes.




I knew that the hole had to be 4" high but I was keeping what you said in mind and that is to know why you do such things and not just doing things so I tried to find exactly what my tub would need.

I'm confused, what's dm? :s


--------------------
:sporedrop:"The internet has one rule; use or be used" - Bjeldiablo :sporedrop:
''there is no loneliness, only moments where contentment is fleeting''

SBJs "The Basics"
3iRiS9 "Cirque du freak"
B+ BONANZA

   

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Offlinespacechildo
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Re: Help with some math skills [Re: Rosen_Rot]
    #21584844 - 04/23/15 09:45 AM (9 years, 27 days ago)

dm = decimetres = 10 cm.
1 dm3 = 1 litre.

Your first sentence says you wanted to know where to place your holes,
if you say you're doing them at 4" I'm not sure I understand the question?

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OfflineRosen_Rot
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Registered: 12/06/14
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Re: Help with some math skills [Re: spacechildo]
    #21584940 - 04/23/15 09:54 AM (9 years, 27 days ago)

I'm sorry I think I worded it wrongly. I meant to ask that I wanted to know at what height I should place my holes according to the dimensions of my tub. I found H but I came full swing to the original height which doesn't add up.

I really didn't want to just use 4" as a standard, since each tub is different in size, but that's what I ended up doing in the end ><

This standard (4") is the substrate level + 1inch height right?

How is substrate+spawn measured in litres? How is it relative?

As far as I know the coir is measured in grams and verm by the qts.


--------------------
:sporedrop:"The internet has one rule; use or be used" - Bjeldiablo :sporedrop:
''there is no loneliness, only moments where contentment is fleeting''

SBJs "The Basics"
3iRiS9 "Cirque du freak"
B+ BONANZA

   

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Offlinespacechildo
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Re: Help with some math skills [Re: Rosen_Rot]
    #21585048 - 04/23/15 10:07 AM (9 years, 27 days ago)

even tho all tubs are different you want a 3-4" sub depth in a monotub anyway.
put the holes at 4".

sub+spawn in litres/quarts (they're so close it doesnt matter)
is relative because you use volume in ratio measurements.
a 1:2 ratio means 1 qt of spawn to 2 qts of sub, not 1 qt spawn to x grams of coir.

so say you want a 3" sub depth with a 1:2 ratio, you need 16 qts in total to get to 3" depth in your tub.
that equals to 5qt's spawn to 10qts sub, or 5,3 to 10,6 if you wanna be exact.

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OfflineRosen_Rot
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Re: Help with some math skills [Re: spacechildo]
    #21585071 - 04/23/15 10:14 AM (9 years, 27 days ago)

Aha so thats why :takingnotes:

Thank you so much spacechild! Helpful as always :biggrin: :biggrin:


--------------------
:sporedrop:"The internet has one rule; use or be used" - Bjeldiablo :sporedrop:
''there is no loneliness, only moments where contentment is fleeting''

SBJs "The Basics"
3iRiS9 "Cirque du freak"
B+ BONANZA

   

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Offlinespacechildo
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Re: Help with some math skills [Re: Rosen_Rot]
    #21585086 - 04/23/15 10:18 AM (9 years, 27 days ago)

just glad you understood it! :super:

I'm european so I dont measure things in inches, qts and gallons,
I'm sure there's a way to calculate from inches to gallons/qt's but I only know of decimetres to litres.

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OfflineRosen_Rot
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Registered: 12/06/14
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Re: Help with some math skills [Re: spacechildo]
    #21585140 - 04/23/15 10:28 AM (9 years, 27 days ago)

I'm European also which is why I find it confusing with qts and all that but since they are relatively close I guess I can ease up and not wreck my brain so much.

How did you do the calculation to find out you need 16qts of spawn+sub for a 3" deep sub?

I wanna note down your previous explanation as an example and it would help if I had the calculation just incase the variable of sub depth changes


--------------------
:sporedrop:"The internet has one rule; use or be used" - Bjeldiablo :sporedrop:
''there is no loneliness, only moments where contentment is fleeting''

SBJs "The Basics"
3iRiS9 "Cirque du freak"
B+ BONANZA

   

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Offlinespacechildo
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Re: Help with some math skills [Re: Rosen_Rot]
    #21585172 - 04/23/15 10:35 AM (9 years, 27 days ago)

sure, I used your tub measurements and simply went from centimetres to decimetres.
54 cm = 5,4 dm.
41 cm = 4,1 dm.

those 2 multiplied gives you your base area.

now multiply the base area with the desired height. 4" = 10cm = 1dm.

that gives you 5,4dm x 4,1dm x 1dm = 22,1 (22) dm3 / litres.

3" = 7,5cm = 0,75 dm, gives you 5,4dm x 4,1dm x 0,75dm = 16 dm3 aka litres.

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OfflineRosen_Rot
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Registered: 12/06/14
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Re: Help with some math skills [Re: spacechildo]
    #21585211 - 04/23/15 10:46 AM (9 years, 27 days ago)

:takingnotes: :takingnotes: :takingnotes:

Thank you! In my reference note it goes :smile:


--------------------
:sporedrop:"The internet has one rule; use or be used" - Bjeldiablo :sporedrop:
''there is no loneliness, only moments where contentment is fleeting''

SBJs "The Basics"
3iRiS9 "Cirque du freak"
B+ BONANZA

   

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